Removable coupling-sleeve.



E. J. F. AUDEMARS.

REMOVABLE COUPLING SLEEVE. APPLICATION FILED JUNE 5.19:7.

Patented Aug. 13, 1.918;.

goI's AUnnMARs, citizen of the Republic of unrrnn sTA f-fi EN ew-1 4 y y y Y EDMONDJULES FRANQOIS AUDEMARS, OI PARIS, FRANCE.

To all whom may concern.-

Be it known thatI, EDMOND Johns rm- Switzerland, residing at 7' Rue La1o,-Paris, in the. Republic of France, have invented new and useful Improvements inRemovable v Coupling-Sleeves, of which the following is v a specification.

4 substance, this The object of the present invention is to provide a coupling sleeve for the tight fixing of tubesinrubber or other elastic-material;

nozzles in metal or other hard sleeve being principally note-. it being upon pipes or worthy for its removability, that is, easy to apply and remove. The coupler 1 is formed having an inner conical surface provided with sunken relief parts, While the'large end of the cone forms the main openingofthe sleeve. The sunken or relief parts may consist of a number of cir- .cular grooves of rectangular profile, which are laid out with reference to a common cylindrical surface coaxial with the sleeve and such grooves are also laid outwith referof account the conical shape of the sleeve. .In this case the depth of the grooves will be smaller according as they lie nearer the large end of the cone. These leaving out parts in sunken relief may also have the form of spiral grooves with a parallelogram section, and may be single or multiple, and

ence to a common cylindrical surface, and the depth of the spiral grooves diminishes progressively as they approach the large end of the sleeveby reason of its conicity. Again considering the case of sunken portions laid out upon a common cylindrical surface coaxial with the sleeve, it is possible to give the grooves the form of oblique threads or screw threads such as are employed upon the boreof cannon in common practice.

lngeneral the sunken parts can'be given any suitable shape which does not interfere withthe essential principle of the removdesigned and which can only be reallzed inv ability of the coupler. In any case, the sunken parts allow of increasing the utility of the coupler device and of producing greater efficiency as concerns the three following functions for which the coupler'is an imperfect manner by the use of a smooth conical surface, even in case said surface nnmovnnnr. courmne-stnnvn.

i i Specification of Letters intent.

essentially of a 2. To prevent any lengthwise slipping of Patented Aug. 13, 1918.. Application-filed June 5,1917. Seria11To. 173,061.

To insure a tightjoint which Will prethe elastic tube upon the tube of hard material.

3. To prevent any slipping of the coupler proper upon the elastic tube.

In cases where the slipping of the coupler would .producea dangerous effect, the

coupler may be provided with a removable I safety tube. I y

In the accompanying drawing which is of an illustrative nature a device for locking it upon the elastic Figure 1 indicates the method of joining a rubber tube with a metal tube which is carried out by a coupler designed according to the present invention. a Fig. 2 is a longitudinal section of another type of couplerdesigned "1 accordingto the present invention. F

Fig. .3 is a longitudinalsection of the coupler represented in; Fig. 1.-

plers.

Referring to Fig. 1, the tight joint- 0 Fig, 4- shows another design for such con method according to the present invention consists essentially in the compression of the end of the rubber tube or upon the metal tube 6 by the pressure exerted by a coupler .0 of hard material, this coupler having on its interior a conical surface of suitable slope and length and providedwith sunken relief portions. In order to apply a conpler sleeve ofthe present kind it is first slipped over the metal tube 6 with the small end first, then the rubber tube is fitted upon the tube 1), and after lubricating the end of the rubber tube,.the coupler c is applied in such manner as to compress the elastic substance in a progressive manner and *over almost the whole length of the cone. This elastic substance then expands in the sunken portions'as represented at f and thus forms a series of ridges which prevent the coupler from being-'thrown'ofi' on account of the reaction produced by the compression already exerted on the substance.

As indicated inFig. 2, the sunken portions may have the form of circular grooves ll e which are independent of each other and are all laid out aecording to a common cylindrical surface of diameter d and coaxial with the cone, and owmg to the conicity of the sleeve, the depth of these grooves in to putting on the coupler or to removing it,

and at the same. time the coupler has all the required qualities for making the tight joint. These conditions are complied with by giving the grooves a special design in spiral as shown at f in Figs. 1 and 3, and here the profile has the form of a parallelogram. These grooves or threads of spiral form and either single or multiple, are laid out according to a common cylindrical surface of diameter al their depth increases progressively on approaching the apex of the cone. The grooves may be used upon the whole length of the conical portion or only upon a part of said length.

It will be remarked that these grooves formed in a-cylindrical surface and limited by a conical surface, must be clearly distinguished 1n thelr form from an ordinary screw thread upon a cylindrical surface, and

even form a screw thread upon a conical surface. In fact, in the method indicated here, the female threads are all brought out to a common cylindrical surface, while the male threads become constantly narrower on account of the conicity of the sleeve. On the contrary, in the case of a conical screw thread, the male and female threads have a shorter diameter according to the progression of the thread from base to summit.

Another application of the present method of disposing certain parts of the cone in sunken relief, consists in employing oblique or screw thread grooves analogous to the grooves used commonly upon the bore of a cannon. Such grooves ,are indicated at g in Fig. 4; and are laid out upon a common cylindrical surface having a diameter d they may be used upon the entire surface of the cone, but it is preferable to employ them upon only a part of this. surface in order to assure a tighter fitting of the system. It is readily understood that in the designs indicated in Figs. 1,3 and 4, the elastic substance expands within the grooves to its primitive shape which is that of a cylinder, and the expansive force needed to produce the pressure at-the joint will depend simply Again referring to the designs indicated in Figs. 1, 3 and l, it will also be remarkedthat the grooves or threads act in opposition to longitudinal thrusts exerted along the axis of the tube, and accordingly the coupler is prevented from slipping upon the elastic material. {)n the other hand, the grooves or threads do not retain the coupler when a tangential movement is given to the surface of the tubes or the coupler.

In case the slipping of the cou'plershould be attended with dangerous results, a removable fixing device can be employed with the coupler in order to prevent it from slipping off the rubber tube. This latter device may consist of a collar which fits upon the rubber by compression at one end, while the other end is fixed to the sleeve. Another method is to hold on the cone by suitably fixing it to the metal tube.

It is understood that the above-described.

couplers may be modified in their details of construction without departing from the the tube of elastic material and provided with sunken portions upon the internal conical surface, the outer parts of these sunken portions being laid out according to a cylindrical surface; substantially as described and for the purpose set forth.

2. A detachable pipe coupling for detachably assembling a tube of hard material and atube of elastic material, consisting in the combination of a tube of hard material; a tube of elastic material whose end is fitted upon the end of the tube of hard material; and a coupler with an internal conical surface designed to be fitted upon the end of the tube of elastic material and provided withsunken portions upon the internal conical surface,the outer parts of these sunken portions being laid out according to a cylindrical surface coaxial with the conical surface, substantially as described and for the purpose set forth.

3. A detachable pipe coupling for detachably assembling a tube of hard material and a tube of elastic material, consisting in the combination of a tube of hard material; a tube of elastic material whose end is fitted upon the end of the tube of hard material; and a coupler with an internal conical surface designed to be fitted upon the end of the tube of elastic material and provided with sunken portions forming spirals Intestimony whereof I have signed my or screw threads laid out upon the internal, name to this specification in the presence of sunken portions being laid out according to .a, cylindrical surface coaxial with the conical I surface, substantially as described and. for

the purpose set forth.

' conical surface, the outer parts of these two subscribing witnesses.

EDMOND JULES FRANCOIS AUDEMARS. Witnesses: Y

LOUIS Moses, CHAS. P. PREssLY. 

